Java8新特性 重復註解與類型註解
阿新 • • 發佈:2019-01-27
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import java.lang.annotation.Repeatable; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; import static java.lang.annotation.ElementType.*; @Repeatable(MyAnnotations.class) @Target({TYPE, FIELD, METHOD, PARAMETER, CONSTRUCTOR, LOCAL_VARIABLE,TYPE_PARAMETER}) @Retention(RetentionPolicy.RUNTIME)public @interface MyAnnotation { String value(); }
import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; import static java.lang.annotation.ElementType.*; @Target({TYPE, FIELD, METHOD, PARAMETER, CONSTRUCTOR, LOCAL_VARIABLE,TYPE_PARAMETER}) @Retention(RetentionPolicy.RUNTIME)public @interface MyAnnotations { MyAnnotation[] value(); }
public class TestAnnotation { @MyAnnotation("hello") @MyAnnotation("world") public void test() { } }
Java8新特性 重復註解與類型註解